Click on a state on a map or list to access status of geologic mapping at the scales of 1:24,000 and 1:100,000 under the National Cooperative Geologic Mapping Program (NCGMP) providing federal matching funds for state geologic work.
Description of the Status and Trends program, which monitors the abundance, distribution, productivity, and health of the Nation's living resources, detecting and evaluating changes in these variables over time.
Description and history of the stream-gaging program of the USGS with information on the networks and monitoring stations, data-collection process, uses of streamflow data, and evaluation of the program.
Describes organizational process and field study used to estimate production capacity (mostly by artisanal miners) in the parts of the country likely to contain diamonds. We estimate a production capacity of 600,000 carats per year.